panic: runtime error: index out of range

[mgusek]

Hi,
i'm running exporter in debug mode in foreground. My BigIP has Version BIG-IP 11.6.0 Build 5.0.429 Hotfix HF5. After a while, i'm getting this error:

---

17:42:57 DEBUG node_collector.go:204 Successfully fetched statistics for nodes
17:42:57 DEBUG node_collector.go:211 Getting node statistics took 585.037792ms
17:42:57 DEBUG pool_collector.go:372 Successfully fetched statistics for pools
17:42:57 DEBUG pool_collector.go:379 Getting pool statistics took 870.630355ms
17:42:58 DEBUG vs_collector.go:504 Successfully fetched statistics for virtual servers
17:42:58 DEBUG vs_collector.go:511 Getting virtual server statistics took 2.202604024s
17:42:58 DEBUG rule_collector.go:167 Successfully fetched statistics for rules
17:42:58 DEBUG rule_collector.go:174 Getting rule stats took 2.259964622s
17:42:58 DEBUG bigip_collector.go:61 Total collection time was: 2.260005406s
17:43:58 DEBUG vs_collector.go:504 Successfully fetched statistics for virtual servers
17:43:58 DEBUG vs_collector.go:511 Getting virtual server statistics took 1.680180309s
17:43:58 DEBUG node_collector.go:204 Successfully fetched statistics for nodes
17:43:58 DEBUG node_collector.go:211 Getting node statistics took 1.725774764s
panic: runtime error: index out of range

goroutine 8306 [running]:
panic(0x858c00, 0xc4200100d0)
/usr/local/go/src/runtime/panic.go:500 +0x1a1
github.com/ExpressenAB/bigip_exporter/collector.(*RuleCollector).Collect(0xc42005cf40, 0xc4207ce1e0)
/Users/christoffer.gunning/golang/src/github.com/ExpressenAB/bigip_exporter/collector/rule_collector.go:155 +0x812
github.com/ExpressenAB/bigip_exporter/collector.(*BigipCollector).Collect.func1(0xc4207ce1e0, 0xc42049c1e0, 0xafd0e0, 0xc42005cf40)
/Users/christoffer.gunning/golang/src/github.com/ExpressenAB/bigip_exporter/collector/bigip_collector.go:53 +0x3b
created by github.com/ExpressenAB/bigip_exporter/collector.(*BigipCollector).Collect
/Users/christoffer.gunning/golang/src/github.com/ExpressenAB/bigip_exporter/collector/bigip_collector.go:55 +0x141

How can i help to solve this ?

Michael

[cgunning]

Hi, Michael!

Thanks for your issue. I have been home sick these last couple of days so I apologize for the late reply. This seems to be similar to a previous issue. I will get back to you with more information regarding identifying the issue and I'd be really grateful if you'd be able to help.

Best regards,
Christoffer Gunning

[cgunning]

The problem seems to be that usually there are events for iRules such as HTTP_REQUEST or HTTP_RESPONSE.

The error is in the following code:

keyParts := strings.Split(key, "/")
path := keyParts[len(keyParts)-2]
pathParts := strings.Split(path, "~")
partition := pathParts[1]
eventParts := strings.Split(pathParts[len(pathParts)-1], ":")
ruleName := eventParts[0]
event := eventParts[1]

And it assumes that the structure of the response is <partition>~<rule-name>:<event>

It seems that because it fails for you, you do not have those events

[cgunning]

Here's an example for how my output looks. Are you able to provide me with an example of an output from what you get? The relevant part in this issue is the first line. "https://localhost/mgmt/tm/ltm/rule/~<partition>~<rule-name>/~<partition>~<rule-name>:<event>/stats". From what I can guess, you do not have the :<event> part.

    "https://localhost/mgmt/tm/ltm/rule/~<partition>~<rule-name>/~<partition>~<rule-name>:<event>/stats": {
      "nestedStats": {
        "kind": "tm:ltm:rule:rulestats",
        "selfLink": "https://localhost/mgmt/tm/ltm/rule/~<partition>~<rule-name>:<event>/stats?ver=12.1.1",
        "entries": {
          "aborts": {
            "value": 0
          },
          "avgCycles": {
            "value": 261253
          },
          "eventType": {
            "description": "HTTP_REQUEST"
          },
          "failures": {
            "value": 78
          },
          "maxCycles": {
            "value": 4421906
          },
          "minCycles": {
            "value": 9906
          },
          "tmName": {
            "description": "/<partition>/<rule-name>"
          },
          "priority": {
            "value": 100
          },
          "totalExecutions": {
            "value": 88051028
          }
        }
      }
    }

[mgusek]

Hello Christopher,
running https://localhost/mgmt/tm/ltm/rule/~Common~/stats i get stats:

{
"kind":"tm:ltm:rule:rulestats",
"generation":1,
"selfLink":"https://localhost/mgmt/tm/ltm/rule/~Common~/stats?ver=11.6.0",
"entries":{
"aborts":{
"value":0
},
"avgCycles":{
"value":0
},
"eventType":{
"description":"HTTP_REQUEST"
},
"failures":{
"value":0
},
"maxCycles":{
"value":0
},
"minCycles":{
"value":0
},
"tmName":{
"description":"/Common/"
},
"priority":{
"value":500
},
"totalExecutions":{
"value":0
}
}
}
(sorry for non indent) As you can see, where is no ':' in my request. Hope it helps.

Michael

[cgunning]

Thanks for the information.

Hmm. Alright. eventType is in the json as well so perhaps I'll have to take that instead. Just to be fully clear. Do you get the same kind of answer when you run against /mgmt/tm/ltm/rule/stats? (without the :).

[mgusek]

Yes, I'm used https://<FQDN_F5>/mgmt/tm/ltm/rule/Common<rule_name>/stats for example above.